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Compiled from official state licensing boards · Updated May 2026
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How to Become a Plumber in Washington (2026)

Step-by-step path to becoming a licensed plumber in Washington: experience hours, apprenticeship, exams, fees and license tiers for 2026.

The license tiers in Washington

1
Journey Level Plumber (PL01)
journeyman · 8,000 hrs experience · exam required

Informational only — not legal advice, and not an official government resource. Licensing rules change; always confirm against the official board source linked on this page before you renew, apply, or make a business decision. Trade Cert Hub is independent and not affiliated with any state licensing board.

Step by step

  1. 1

    Get trained and start logging hours

    Begin documented work experience under a licensed plumber. Keep careful records — the board will want proof of your hours.

  2. 2

    Accumulate the required experience

    Log about 8,000 hours (roughly 4 years) of qualifying experience before you can sit for the journey level plumber (pl01) exam.

  3. 3

    Pass the Washington licensing exam

    Apply to test and pass the journey level plumber (pl01) exam, administered through WA L&I. Study the current UPC edition your state enforces.

  4. 4

    Apply, pay, and get licensed

    Submit your application to WA L&I. Once licensed, you renew on a set cycle and complete continuing education to keep it active.

Get exam-ready

The Washington plumber exam trips up a lot of first-timers. Practice tests and study guides shorten the path.

Plumber exam prep with Trade Exam Academy

Frequently asked questions

How long does it take to become a plumber in Washington?
Plan on roughly 4+ years from apprentice to your first independent license, depending on how quickly you log hours and pass the exam.
Do I need to pass an exam?
Yes — Washington requires a licensing exam, administered through WA L&I. Trade-knowledge and business-and-law sections are common.
What does it cost to get licensed?
Costs include the application fee, exam fees, study materials, and — at the contractor tier — a bond and insurance. Confirm current fees with the board.

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